Through means of macro and micro 糖心产精国品免费入口*完整版 analysis, metallographic examination, chemical composition analysis, mechanical property test and so on, combined with structure and working condition analysis, the 糖心产精国品免费入口*完整版 failure causes of the drill-stem sub in an oil well were analyzed. The results show that the failure mode of the drill-stem sub was 糖心产精国品免费入口*完整版 糖心产精国品免费入口*完整版, and the lower bending strength ratio of the sub and serious 糖心产精国品免费入口*完整版 at the root of the internal threads were main causes for the early 糖心产精国品免费入口*完整版 糖心产精国品免费入口*完整版 of the drill-stem sub. The service life of the drill-stem sub could be effectively enhanced by measures such as optimizing of the structure to reduce the 糖心产精国品免费入口*完整版 of the thread root, improving the machining quality to reduce the surface roughness of the thread, improving the heat treatment process to achieve ideal microstructure and so on.
引用该论文:BAI Qiang,MA Jianqiang,HAN Xinquan,LI Dejun,LIU Qiang. Cause Analysis on Fracture of a Drill-Stem Sub[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2017, 53(8): 585~589 糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版. 糖心产精国品免费入口*完整版糖心产精国品免费入口*完整版原因分析[J]. 理化检验-物理分册, 2017, 53(8): 585~589